Validity of the Stanford-Binet Intelligence Scale IV: Its use in young adults with mental retardation

The validity of the Stanford Binet-IV (SB-IV) was assessed. This test and t he WAIS-R and WRAT-R were administered to 42 adults previously classified w ith mild to moderate mental retardation. Validity coefficients between scor es on the SB TV and the other two measures were significant. The mean Ia on the SB IV (mean Test Composite = 43.26) was significantly lower than that on the Wechsler Adult Intelligence Scale-Revised-WAIS-R (mean Full-Scale Ia = 57.91). With regard to the internal validity of the SE-IV, the intersubt est relationships of each of the four Area scores correlated significantly with the Test Composite (range = .66 to .91), Verbal Reasoning earned the h ighest correlation (.91). Results support the SB-IV's concurrent, criterion -related, and internal validity for use with young adults who have mental r etardation.